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Manufacturer of geophysical resistivity and IP imaging systems
2121 Geoscience Dr., Austin, TX 78726, USA
phone: +1(512)335-3338, fax: +1(512)258-9958
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AGI STING/Swift case history 6
Marine channel submerged survey
Summary:
A utility tunnel between the mainland and Fisher Island in Miami, Florida was going to be constructed. As part of pre-construction investigations the Sting/Swift system was utilized to obtain a resistivity imaging profile along the stretch of the tunnel. Thanks to the waterproof Swift cable and the extremely high resolution of the Sting R1 resistivity receiver good data was obtained in spite of the adverse conditions with the electrodes in constant contact with sea water. The data was inverted using Res2Dinv which is capable of compensating for submerged measurements.
Description
- 28 electrodes at 6m spacing were placed on the bottom along the tunnel stretch.
- The survey was made utilizing the Schlumberger array.
- The recorded data were inverted and interpreted using the RES2DINV software package. Surfer for Windows was used for result presentation in the sections shown above. This interpretation was done in a couple of hours including data transfer to the Surfer software for final report printing.
Pictures gallery:
| The Swift cable with electrodes was laid out from a small motor boat. The Sting/Swift instrument was kept on the beach during the measurement. |
| The picture shows the approximate stretch of the profile, with Fisher Island in the background as a Coast Guard patrol boat passes in the shipping channel. The Swift cable disappears over the beach edge into the clear blue water. |
| The yellow Swift cable was duct taped to a blue carry nylon rope. In order to keep the cable in place on the bottom, two lead weights were taped on each side of every electrode. An additional lead weight was taped in the middle between each electrode. |
Last modified: 2006-09-07 18:29:19 EDT
